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Strain analysis in Geological materials using Neutron diffraction and AE signal measurement at J-PARC/BL19 "TAKUMI"

Abe, Jun*; Sekine, Kotaro*; Harjo, S.; Gong, W.; Aizawa, Kazuya

Acoustic emission (AE) signal can detect crack initiation and deformation behavior in material. Macroscopic deformation and fracturing of rock materials might be influenced by these phenomena. In order to investigate deformation mechanism of rock samples, simultaneous measurements of neutron diffraction pattern and AE signal have been performed at the Engineering Materials Diffractometer "TAKUMI" in J-PARC. Two types of rock samples were applied to the experiments. Discrepancy is found between microscopic strain and lattice strain. And AE signals from rock samples which might be generated by grain slip and pore collapse were detected. Macroscopic strain in rock sample might be associated with not only lattice strain but also mineral grain slip and pore collapse generated inside rock. It is indicated that combination of signal measurements and diffraction technique is effective tool to investigate deformation mechanism in rock materials.

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